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Water-tight <br /> traffic box Ground surface <br /> or 2.5 feet <br /> high steel riser <br /> Locking <br /> mechanism <br /> Concrete <br /> 20 feet <br /> Bentonite and <br /> Portland Cement <br /> Bentonite pellets —► 3 ft minimum <br /> 4 in. Sch. 40 <br /> blank 2 ft minimum <br /> PVC casing <br /> 4 in. Sch. 40 — <br /> PVC screen <br /> with 0.010 — <br /> inch Slots Static ground water at 36 feet <br /> Filter Pack below ground surface <br /> approximately 20 feet <br /> Threaded end plug EA ENGINEERING, <br /> SCIENCE, AND <br /> or slip cap TECHNOLOGY, INC. <br /> 41A Lafayette Circle <br /> Lafayette, CA. 94549 <br /> Figure 4. Representative details of proposed <br /> monitoring wells, former Chevron SS 9-1918 Drawn TRW Date 1-11-89 <br /> 45 E. Harding Way, Stockton, California Reviewed Date <br />